| Mason Smith & Leisching | - | Murchison | LX1 | 1924 |
| Massa | Singh | Meekatharra | MZ3 | 1924 |
| Massam | T. B. | Tara Estate, Koojan | 7TM and 48B, 47E | 1962 |
| Massam | W. E. | Douerdine, Mukinbudin | W0M and 30B, 51F | 1962 |
| Massam Bros. | - | Scarisbrick, Yerapin, via Erikin | CM3 and 7B, 102A | 1962 |
| Massey | F. J. | The Ranch, South Coogee | FM1 and 41B, 6E | 1962 |
| Massey | Joseph | Leases 18594/74, 32090/55 Totadgin | M5Y | 1924 |
| Massey & Harris | - | Quindinup, Yallingup | 3MH | 1912 |
| Massey & Harris | - | Quindinning, Yallingup | 3MH | 1924 |
| Massingham | C. W. | Milligham, Kellerberrin | MK4 | 1912 |
| Massingham | C. W. | Millingham, Kelleberrin | MK4 | 1924 |
| Massingham | C. W. | Milligan, Perth | MK4 and 4D, 9E | 1962 |
| Massingham | J. C. | Grey Glen, Kellerberrin | LL2 | 1912 |
| Massingham | J. C. | Grey Glen, Kellerberrin | LL2 | 1924 |
| Massingham | L. B. | Cagerping, Kellerberrin | L3M | 1912 |
| Massingham | L. B. | Cagerping, Kellerberrin | L3M | 1924 |
| Masson | W. J. | Capel, Wellington | 3WM | 1912 |
| Masson | W. J. | Capel | 3WM | 1924 |
| Mastaglia | F. | 10959 and 6254, Greenbushes | F3N | 1962 |
| Mastaglia | G. | Swan 262-3, Bayswater | G5M and 16C, 15E | 1962 |
| Masters | A. & M. | Dee Swamp, Beermullah, via Gingin | 4VD and 13A, 22B | 1962 |
| Masters | C. E. | Llaroo, Nungarin | K3M and 71A, 36B | 1962 |
| Masters | Chas. | Sunnyside, Tammin | C8M | 1912 |
| Masters | Chas. | Sunnyside, Tammin | C8M | 1924 |
| Masters | F. L. | Block 1, sub-Division 1114, Swan View | FM2 and 25D, 46E | 1962 |
| Masters | F. W. | Dunroven, Wagin | MX8 and 4B, 119E | 1962 |
| Masters | G. F. & L. E. | Pulborough 72 and 253, Manjimup | TC7 and 45B, 21E | 1962 |
| Masters | H. C. | Lots 6/336, Byford | H1M | 1962 |
| Masters | Heury | East Wagin | OU3 | 1924 |
| Masters | Howard Grigg | Noggogering, Northam | H0M | 1926 |
| Masters | J. H. | Yirringerie, Darkan | 4SY and 115A, 14C | 1962 |
| Masters | J. H. | Sideup, Mt. Barker | 6MZ and 17A, 35B | 1962 |
| Masters | J. R. & E. I. | Glen Avon, Northam | 7MX and 28D, 118E | 1962 |
| Masters | Mary E. | Dee Swamp, Gingin | VD5 | 1924 |
| Masters | T. A. | River Garden, Wellington Loc. 1278, Collie | 0TA | 1962 |
| Masters | T. F. | Belvedere, Coomberdale | TM3 and 14A, 29B | 1962 |
| Masters | Thos. | Blocks 37, 38, 39, 122, 123, Broomehill | TM9 | 1912 |
| Masters | Thos. | Blocks 37-9, 122-3, Broomehill | TM9 | 1924 |
| Masters & Son | - | Lot 413, East Belmont | M2Z and 22A, 13C | 1962 |
| Masters & Sons | - | Walhalla, Piawaning | V7M and 40B, 10A | 1962 |
| Masterson | Thomas | Commonage, Nullagine | M4U | 1924 |
| Masterson & Doherty | Thos. & Michael | Eastern Creek, Nullagine | J3U | 1924 |
| Mather | A. & W. | 8440, 7702, 6652, 8482, 8687, Kellerberrin | H5J and 21C, 12A | 1962 |
| Mather | A. B. | Redfern, Collanillin Road, East Wagin | L70 | 1912 |
| Mather | A. B. | Redffern, Collanilling Road, East Wagin | L7O | 1924 |
| Mather | Andrew | Linger and Die Farm, Gnowangerup | M0A | 1912 |
| Mather | Andrew | Linger and Die Farm, Gnowangerup | M0A | 1924 |
| Mather | G. E. | Aroma, West Dale, Beverley | M0A and 16A, 32B | 1962 |
| Mather | G. E. | Victoria Loc. 8279, 8761, 5731, 8793, Pindar | MB0 and 35D, 26E | 1962 |
| Mather | J. J. & H. | Homestead, Kellerberrin | H5J | 1912 |
